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  2. 30 Math Puzzles (with Answers) to Test Your Smarts - AOL

    www.aol.com/30-math-puzzles-answers-test...

    The post 30 Math Puzzles (with Answers) to Test Your Smarts appeared first on Reader's Digest. ... And, if you prefer your riddles free of math, we have great riddles for kids too. Math puzzles ...

  3. Worksheet - Wikipedia

    en.wikipedia.org/wiki/Worksheet

    The form comes with two worksheets, one to calculate exemptions, and another to calculate the effects of other income (second job, spouse's job). The bottom number in each worksheet is used to fill out two if the lines in the main W4 form. The main form is filed with the employer, and the worksheets are discarded or held by the employee.

  4. Mental calculation - Wikipedia

    en.wikipedia.org/wiki/Mental_calculation

    So the estimated square root of 15 is 3.875. The actual square root of 15 is 3.872983... One thing to note is that, no matter what the original guess was, the estimated answer will always be larger than the actual answer due to the inequality of arithmetic and geometric means. Thus, one should try rounding the estimated answer down.

  5. Mental abacus - Wikipedia

    en.wikipedia.org/wiki/Mental_abacus

    Mental calculation is said to improve mental capability, increases speed of response, memory power, and concentration power. Many veteran and prolific abacus users in China, Japan, South Korea, and others who use the abacus daily, naturally tend to not use the abacus any more, but perform calculations by visualizing the abacus.

  6. Mathnasium - Wikipedia

    en.wikipedia.org/wiki/Mathnasium

    Mathnasium separates levels of instruction into early education, elementary school, middle school, and high school. Students advance to a new level of study when they demonstrate mastery of the subject through completing mastery checks, where students have to answer a worksheet of problems correctly without help from instructors.

  7. Big Brain Academy - Wikipedia

    en.wikipedia.org/wiki/Big_Brain_Academy

    Each game in the series asks players to complete tests in which they must answer questions or solve minigame-style puzzle activities in order to calculate and measure the "mass" and "age" of their brain. Minigames are designed to test player's memory, logic, math, and analysis skills, with each one being able to be completed in under a minute ...

  8. Exercise (mathematics) - Wikipedia

    en.wikipedia.org/wiki/Exercise_(mathematics)

    In China, from ancient times counting rods were used to represent numbers, and arithmetic was accomplished with rod calculus and later the suanpan.The Book on Numbers and Computation and the Nine Chapters on the Mathematical Art include exercises that are exemplars of linear algebra.

  9. Subtraction - Wikipedia

    en.wikipedia.org/wiki/Subtraction

    The answer is 1, and is written down in the result's hundreds place. There is an additional subtlety in that the student always employs a mental subtraction table in the American method. The Austrian method often encourages the student to mentally use the addition table in reverse.

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